My 7i76e Connection Sheet
11 Feb 2021 15:14 #198407
by fons
Replied by fons on topic My 7i76e Connection Sheet
i'm working on a mill (cincinnati cim-x) there is no encoder on the mill-axis and mechanical nearly inposible to place it there
can it also work when i place the encoder on the motor and add some lines in the hal (an idea of what lines)
i like to use rigide tapping
how many puls do in need maybe 2 or 3 magnetic sensor placed on a gear in the gearbox can also work ?
can it also work when i place the encoder on the motor and add some lines in the hal (an idea of what lines)
i like to use rigide tapping
how many puls do in need maybe 2 or 3 magnetic sensor placed on a gear in the gearbox can also work ?
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11 Feb 2021 19:23 #198430
by andypugh
I think that there are probably more CNC machines with the encoder on the motor than on tha axis.
Encoders on the motor works fine, and needs no special config.
Replied by andypugh on topic My 7i76e Connection Sheet
i'm working on a mill (cincinnati cim-x) there is no encoder on the mill-axis and mechanical nearly inposible to place it there
can it also work when i place the encoder on the motor
I think that there are probably more CNC machines with the encoder on the motor than on tha axis.
Encoders on the motor works fine, and needs no special config.
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11 Feb 2021 21:39 #198449
by fons
Replied by fons on topic My 7i76e Connection Sheet
when you use rigid taping the system need to know the puls/ revolution
there is a gearbox with 16 speeds
when the encoder is placed on the spindel its always the same value of pulses
not with a gearbox place in different gears
or does it mathers ? what i don't believe
there is a gearbox with 16 speeds
when the encoder is placed on the spindel its always the same value of pulses
not with a gearbox place in different gears
or does it mathers ? what i don't believe
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11 Feb 2021 22:02 #198452
by andypugh
The spindle encoder needs to be on the spindle, yes.
But there was nothing in your previous post to suggest that you were talking about a spindle.
Replied by andypugh on topic My 7i76e Connection Sheet
when you use rigid taping the system need to know the puls/ revolution
there is a gearbox with 16 speeds
when the encoder is placed on the spindel its always the same value of pulses
not with a gearbox place in different gears
or does it mathers ? what i don't believe
The spindle encoder needs to be on the spindle, yes.
But there was nothing in your previous post to suggest that you were talking about a spindle.
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12 Feb 2021 09:18 #198505
by fons
Replied by fons on topic My 7i76e Connection Sheet
what is the min of puls to work propper i have to make one by meselve at the outside of the gearboc
can 180puls/rev be enough ?
can 180puls/rev be enough ?
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12 Feb 2021 13:19 #198529
by andypugh
50 is enough for lathe threading or for gar hobbing, as at a constant speed LinuxCNC can interpolate the output from a low-count encoder.
For rigid-tapping you need to know exactly when the spindle reverses.
With 180 counts you can have (about) 2 degrees of uncertainly in the reversal position.
Does this matter? Quite possibly not. The effect is to give a slightly sloppy thread (assuming perfect Z-axis tracking) but 2 degrees with a 1mm pitch tap is only 5 microns error.
Replied by andypugh on topic My 7i76e Connection Sheet
what is the min of puls to work propper i have to make one by meselve at the outside of the gearboc
can 180puls/rev be enough ?
50 is enough for lathe threading or for gar hobbing, as at a constant speed LinuxCNC can interpolate the output from a low-count encoder.
For rigid-tapping you need to know exactly when the spindle reverses.
With 180 counts you can have (about) 2 degrees of uncertainly in the reversal position.
Does this matter? Quite possibly not. The effect is to give a slightly sloppy thread (assuming perfect Z-axis tracking) but 2 degrees with a 1mm pitch tap is only 5 microns error.
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12 Feb 2021 23:08 #198607
by fons
Replied by fons on topic My 7i76e Connection Sheet
thx for the quick reaction i can go work on mine project in thise way prepairing a 180puls enconder is ABZ enough or do i need also the inverve pulse-A-B-Z
an other problem why an unloaded steppermotor stall at higher speed ?
i make several test and always the same result the stepper motor will not run
i use a mesa 7i76e
i try a nema 17 motor with a lowcost stepper driver 6600 from alliexpressalso
i try it with a leadshine dm556 driver
from xinlichuan the mc425e and mc442e driver with all the same result
i use a small, the adjusted and a high a curent
what more can i try ?
an other problem why an unloaded steppermotor stall at higher speed ?
i make several test and always the same result the stepper motor will not run
i use a mesa 7i76e
i try a nema 17 motor with a lowcost stepper driver 6600 from alliexpressalso
i try it with a leadshine dm556 driver
from xinlichuan the mc425e and mc442e driver with all the same result
i use a small, the adjusted and a high a curent
what more can i try ?
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12 Feb 2021 23:23 #198609
by andypugh
Single-ended works fine.
Steppers have a lot of poles, so the back-emf becomes a problem at lower speed than with a lower pole-count motor.
To run faster, use a higher voltage. What voltage are you using? what is the max that your drives can handle?
Replied by andypugh on topic My 7i76e Connection Sheet
The inverse pulses would be generated by a line-driver, not by the encoder itself.thx for the quick reaction i can go work on mine project in thise way prepairing a 180puls enconder is ABZ enough or do i need also the inverve pulse-A-B-Z
Single-ended works fine.
why an unloaded steppermotor stall at higher speed ?
Steppers have a lot of poles, so the back-emf becomes a problem at lower speed than with a lower pole-count motor.
To run faster, use a higher voltage. What voltage are you using? what is the max that your drives can handle?
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10 Mar 2021 14:04 #201647
by Robert T.
Replied by Robert T. on topic My 7i76e Connection Sheet
Hello Norbert,
I´m working to retrofit an EMCO VMC100 Mill, your connection sheet helped a lot for wiring.
Thank you for the great job you´ve done. MESA´s documentation to their 7i76e delivered more questions than answers to me ...
Robert
I´m working to retrofit an EMCO VMC100 Mill, your connection sheet helped a lot for wiring.
Thank you for the great job you´ve done. MESA´s documentation to their 7i76e delivered more questions than answers to me ...
Robert
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16 Mar 2021 20:41 - 17 Mar 2021 08:11 #202512
by Creative25
Replied by Creative25 on topic My 7i76e Connection Sheet
This sheet helps me a lot.
Just a question. I connected my 7i76e b board with a 5v isolated Power supply at P3 First just left it like that to test Stepper Motors etc. Then I added field power to Tb1 as on your sheet however I did not connect it to Tb3 since I assume that is powered by the 5 volt power supply. When starting linuxcnc I get an error. It warns me about undervoltage.
Also if I measure on pin 5 I get 24 volt.
But there is no power on pin 1-4
I see the manual says both power supplies should have common ground. In my case both are isolated power supplies. Does that mean I should connect the negative poles of the two power supplies together?
Just a question. I connected my 7i76e b board with a 5v isolated Power supply at P3 First just left it like that to test Stepper Motors etc. Then I added field power to Tb1 as on your sheet however I did not connect it to Tb3 since I assume that is powered by the 5 volt power supply. When starting linuxcnc I get an error. It warns me about undervoltage.
Also if I measure on pin 5 I get 24 volt.
But there is no power on pin 1-4
I see the manual says both power supplies should have common ground. In my case both are isolated power supplies. Does that mean I should connect the negative poles of the two power supplies together?
Last edit: 17 Mar 2021 08:11 by Creative25.
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